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You searched for: creator:"Maher Ahmed"
[texts]The next nearest neighbor effect on the 2D materials properties - Maher Ahmed
In this work, the effect of introducing next nearest neighbor (NNN) hopping to the 2D materials was studied using the graphene 2D honeycomb two sublattice as an example. It is found that introducing NNN to the 2D materials removes the symmetry around the Fermi level and shifts it, at a small value of NNN hopping. This effect increases with increasing NNN hopping. If the NNN hopping becomes competitive with nearest neighbor (NN) hopping, the dispersion relations of the 2D materials changes comple...
Downloads: 3
[texts]Understanding of hopping matrix for 2D materials taking 2D honeycomb and square lattices as study cases - Maher Ahmed
In this work, a trial understanding for the physics underling the construction of exchange (hopping) matrix $\mathbf{E}$ in Heisenberg model (tight binding model) for 2D materials is done. It is found that the $\mathbf{E}$ matrix describes the particles exchange flow under short range (nearest neighbor) hopping interaction which is effected by the lattice geometry. This understanding is then used to explain the dispersion relations for the 2D honeycomb lattice with zigzag and armchair edges obta...
Downloads: 3
[texts]SpinWaves in Ferromagnetic Dots 2D Honeycomb Lattice Stripes - Maher Ahmed
In this work, the spin wave calculations were carried out using the Heisenberg Hamiltonian to study the allowed spin waves of zigzag and armchair edged stripes for ferromagnetic nanodots arrayed in a 2D honeycomb lattice \cite{Selim2011}. The Hamiltonian is used to construct the $\mathbf{E}$ matrix which encodes the exchange flow of magnons in the stripes. It is found that the allowed spin wave modes are the eigenvalues of the $\mathbf{E}$ matrix and therefore it is used to study the effects of ...
Downloads: 37
[texts]The effect of edge and impurities sites properties on their localized states in semi-infinite zigzag edged 2D honeycomb graphene sheet - Maher Ahmed
In this work, the tridiagonal method is used to distinguish between edges modes and area modes to study the edge sites properties effect on edge localized states of semi-infinite zigzag 2D honeycomb graphene sheet. The results show a realistic behavior for the dependance of edge localized states of zigzag graphene on the edge sites properties which explaining the experimental results of measured local density of states at the edge of graphene, while at the same time removing the inconsistence be...
Downloads: 5
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